MEWOI6000 power quality analyzer is a product carefully developed by our company and specially designed for field test of three phases, multi-functional and intelligent, man-machine operation and concise and comprehensive test instrument. It is easy to use, large LCD screen display, high resolution, interface in both Chinese and English, shock-proof shell structure and so on. Can simultaneously measure the 4-channel current (ABC three phase and neutral wire current), 4-channel voltage (ABC three-phase voltage and neutral line voltage to ground), the peak value of current voltage, maximum/minimum value over a period, three-phase imbalance factor, short-time voltage flicker, transformer K factor, active power, reactive power, apparent power, power factor and displacement power factor, active power, reactive power, apparent power, total harmonic distortion and harmonic, etc; Display real-time waveform, harmonic ratio bar charts of current voltage; Dynamically capture instantaneous change of voltage current, monitoring starting current, monitoring the power parameters and generate the alarm list, generate the trend chart for a long time record test data.

MEWOI6000 power quality analyzer adopt DSP + ARM double processor architecture, DSP is use for data collection and the processing of algorithm, the ARM is use for the communication protocol and the man-machine interface processing; Analog signal acquisition is by 2 pieces AD7655 of ADI company. Resolution for AD7655 is 16 bit and it is 4 channel synchronous sampling. The highest sampling rate can reach 1 MSPS, to ensure the accuracy of the channel and the information integrity, and wouldn’t miss any transient changes in the grid, can more accurate to detect the transient waveform rising and dropping drastically, and waveform instantaneous interrupt; DSP working frequency is over 200 MHZ, to be able to timely monitoring of the power grid and dynamically adjust the sampling frequency to realize synchronization of power frequency and sampling frequency; Using a 5.6 -inch LCD color screen display, a resolution of 640 dots x 480 dots, with different display color difference between the parameters of phase, waveform, vector diagram, harmonic ratio, the user can be more efficient and more intuitive understand the state of power grid parameters. Built-in flash memory can store 60 group of screenshots at the same time, 150 groups of capture transient voltage/current waveform figure, and 12800 groups of alarm list. Starting current detection model can continuously capture starting current waveform for 100 s. Built-in 2G memory card to store the trend curve record, store all the parameters (including 50 harmonics with 123 power parameters), collect data for once every five seconds, trend curve records can be stored for 300 days.

Active/reactive/apparent electric energy value and gross of each phase

Calculation of transformer K factor

Calculation of COSΦ displacement power factor(DPF) and power factor(PF)

Calculation of flicker

Calculation of three phase unbalance

Function of capture and monitoring

Can monitoring instantaneous change of power grid voltage current parameters, including the voltage fluctuation and flicker, voltage surge, sag and short supply interruption, temporary overvoltage and harmonics. Instruments and can store 150 groups of transient waveform

Function of starting current monitoring

Can monitor the startup current when electrical equipment is starting, help to correctly design capacity. It can display the trend curve of effective value of starting current, the starting current envelope curve, current voltage waveform of the all eight channel. Monitoring for 100 s, can store each cycle of all waveform curve points within 100 s .

Function of storage

Can totally record 123 parameters such as the testing parameter of base testing function(Urms、Uthd、Ucf、Uunb、Hz、Vrms、Vthd、Vcf、Vunb、PST、Arms、Athd、Acf、Aunb、KF、W、VAR、VA、PF、Cos φ、Tan φ),50 harmonics of voltage, 50 harmonic of current. Generate trend curve, the interval time of recording is able to set, collect once for 5s and can stored 75days.

Alarm function

Users can set up 40 groups alarm monitoring project, each group can set different judgments parameters (including 50 harmonics a total of 123 different parameters), can be set different alarm threshold, how long it will take to produce the alarm when over the critical value is can be set, etc. Can store up to a maximum of 12800 set alarm record.

Screenshots function

In any test page screenshots can store the current screen, automatically records the time and test mode at the same time. Such as save the current voltage wave, harmonic bar charts and phasor diagram, etc. Screenshots can be saved up to 60 groups.

Communication function

Communicate with computer by USB interface, monitoring software can display waveform of power quality analysis, able to read those has been detected and captured like transient waveform, trend curve record, alarm list, test screenshots, etc.

Setting function

The user can set the time and date, set the display contrast ratio and brightness, set each corresponding color of each phase line in the instrument

The connection mode of instruments and the grid type can be set

Can select different current clamp and different voltage test strain ratio

Can be selected menu in Chinese or English menu

Chinese/English help menu

Each phase of the operation may at any time by pressing "help" key for related information